Abstract
A series of nitrogen-doped carbons (NCs) were prepared by the pyrolysis (300–900 °C) of crystalline polyazomethine (PAM) synthesized via a facile condensation reaction in methanol solvent. The controlled solvent evaporation resulted in PAM crystals in the form of nanosheet clusters with a sheet thickness of ~50 nm. Such architecture was maintained after pyrolysis, obtaining porous CNs of high specific surface areas of up to 700 m2/g. The resulting NCs were used as absorbents to remove aromatic Rhodamine B from water. The NC that pyrolyzed at 750 °C exhibited the highest adsorption capacity (0.025 mg/mg), which is attributed to its high surface area and surface condition.
Highlights
Porous carbons (PCs) are important materials that have been used throughout human history
If the covalent organic frameworks (COFs) separation process can be conducted in a more controlled manner, it could allow the slow stacking and organization of COFs molecules to yield COFs with long-range ordering and a well-developed 2D architecture. These resultant 2D COFs can be further converted to 2D carbons, which are reminiscent of graphene; the carbon has excellent properties but is difficult to produce
We demonstrate the utility of the COF-derived PC for water purification
Summary
Porous carbons (PCs) are important materials that have been used throughout human history. Among various bottom-up routes, including chemical vapor deposition (CVD) [4], the templating method [5], and the hydrothermal method [6], polymer-derived carbons are the most attractive one, owing to their high yield and low cost In this method, PCs are created by pyrolyzing the synthesized polymeric precursors If the COF separation process can be conducted in a more controlled manner (than precipitation), it could allow the slow stacking and organization of COFs molecules to yield COFs with long-range ordering and a well-developed 2D architecture These resultant 2D COFs can be further converted to 2D carbons, which are reminiscent of graphene; the carbon has excellent properties but is difficult to produce. While this report confined the application to water purification, we expect the material to find use in various other areas, including electronics or optoelectronics, catalysis, photovoltaics, etc., leading to the greater utilization of PAM-based COFs
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